166561150155 has 16 divisors (see below), whose sum is σ = 282174184224. Its totient is φ = 83607165440.

The previous prime is 166561150097. The next prime is 166561150229. The reversal of 166561150155 is 551051165661.

It is not a de Polignac number, because 166561150155 - 2¹⁴ = 166561133771 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326590236 + ... + 326590745.

It is an arithmetic number, because the mean of its divisors is an integer number (17635886514).

Almost surely, 2^166561150155 is an apocalyptic number.

166561150155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166561150155 is a deficient number, since it is larger than the sum of its proper divisors (115613034069).

166561150155 is a wasteful number, since it uses less digits than its factorization.

166561150155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653181006.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 166561150155 in words is "one hundred sixty-six billion, five hundred sixty-one million, one hundred fifty thousand, one hundred fifty-five".